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main.go
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main.go
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package main
import (
"bufio"
"encoding/json"
"io"
"log"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
"time"
"github.com/joeshaw/envdecode"
"github.com/matryer/go-oauth/oauth"
"github.com/nsqio/go-nsq"
"gopkg.in/mgo.v2"
)
var (
authClient *oauth.Client
creds *oauth.Credentials
conn net.Conn
)
type poll struct {
Options []string
}
type tweet struct {
Text string
}
var reader io.ReadCloser
func closeConn() {
if conn != nil {
conn.Close()
}
if reader != nil {
reader.Close()
}
}
func main() {
var ts struct {
ConsumerKey string `env:"SP_TWITTER_KEY,required"`
ConsumerSecret string `env:"SP_TWITTER_SECRET,required"`
AccessToken string `env:"SP_TWITTER_ACCESSTOKEN,required"`
AccessSecret string `env:"SP_TWITTER_ACCESSSECRET,required"`
}
if err := envdecode.Decode(&ts); err != nil {
log.Fatalln(err)
}
client := &http.Client{
Transport: &http.Transport{
Dial: func(netw, addr string) (net.Conn, error) {
if conn != nil {
conn.Close()
conn = nil
}
netc, err := net.DialTimeout(netw, addr, 5*time.Second)
if err != nil {
return nil, err
}
conn = netc
return netc, nil
},
},
}
creds = &oauth.Credentials{
Token: ts.AccessToken,
Secret: ts.AccessSecret,
}
authClient = &oauth.Client{
Credentials: oauth.Credentials{
Token: ts.ConsumerKey,
Secret: ts.ConsumerSecret,
},
}
twitterStopChan := make(chan struct{}, 1)
publisherStopChan := make(chan struct{}, 1)
stop := false
signalChan := make(chan os.Signal, 1)
go func() {
<-signalChan
stop = true
log.Println("Stopping...")
closeConn()
}()
signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
votes := make(chan string) // chan for votes
go func() {
pub, _ := nsq.NewProducer("localhost:4150", nsq.NewConfig())
for vote := range votes {
pub.Publish("votes", []byte(vote)) // publish vote
}
log.Println("Publisher: Stopping")
pub.Stop()
log.Println("Publisher: Stopped")
publisherStopChan <- struct{}{}
}()
go func() {
defer func() {
twitterStopChan <- struct{}{}
}()
for {
if stop {
log.Println("Twitter: Stopped")
return
}
time.Sleep(2 * time.Second) // calm
var options []string
db, err := mgo.Dial("localhost")
if err != nil {
log.Fatalln(err)
}
iter := db.DB("ballots").C("polls").Find(nil).Iter()
var p poll
for iter.Next(&p) {
options = append(options, p.Options...)
}
iter.Close()
db.Close()
hashtags := make([]string, len(options))
for i := range options {
hashtags[i] = "#" + strings.ToLower(options[i])
}
form := url.Values{"track": {strings.Join(hashtags, ",")}}
formEnc := form.Encode()
u, _ := url.Parse("https://stream.twitter.com/1.1/statuses/filter.json")
req, err := http.NewRequest("POST", u.String(), strings.NewReader(formEnc))
if err != nil {
log.Println("creating filter request failed:", err)
}
req.Header.Set("Authorization", authClient.AuthorizationHeader(creds, "POST", u, form))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("Content-Length", strconv.Itoa(len(formEnc)))
resp, err := client.Do(req)
if err != nil {
log.Println("Error getting response:", err)
continue
}
if resp.StatusCode != http.StatusOK {
// this is a nice way to see what the error actually is:
s := bufio.NewScanner(resp.Body)
s.Scan()
log.Println(s.Text())
log.Println(hashtags)
log.Println("StatusCode =", resp.StatusCode)
continue
}
reader = resp.Body
decoder := json.NewDecoder(reader)
for {
var t tweet
if err := decoder.Decode(&t); err == nil {
for _, option := range options {
if strings.Contains(
strings.ToLower(t.Text),
strings.ToLower(option),
) {
log.Println("vote:", option)
votes <- option
}
}
} else {
break
}
}
}
}()
// update by forcing the connection to close
go func() {
for {
time.Sleep(1 * time.Minute)
closeConn()
if stop {
break
}
}
}()
<-twitterStopChan // important to avoid panic
close(votes)
<-publisherStopChan
}